EP2114662A1 - Run-flat tyre expandable band drum - Google Patents

Run-flat tyre expandable band drum

Info

Publication number
EP2114662A1
EP2114662A1 EP07706235A EP07706235A EP2114662A1 EP 2114662 A1 EP2114662 A1 EP 2114662A1 EP 07706235 A EP07706235 A EP 07706235A EP 07706235 A EP07706235 A EP 07706235A EP 2114662 A1 EP2114662 A1 EP 2114662A1
Authority
EP
European Patent Office
Prior art keywords
band drum
sector
intermediate rings
lateral member
annular seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07706235A
Other languages
German (de)
French (fr)
Other versions
EP2114662B1 (en
Inventor
Marco Fabrizio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to PL07706235T priority Critical patent/PL2114662T3/en
Publication of EP2114662A1 publication Critical patent/EP2114662A1/en
Application granted granted Critical
Publication of EP2114662B1 publication Critical patent/EP2114662B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/24—Drums
    • B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
    • B29D30/246—Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D2030/201—Manufacturing run-flat tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/72—Side-walls
    • B29D2030/724—Stiffening the sidewalls, e.g. by using additional inserts, e.g. made of rubber, plastics or other materials

Definitions

  • the present invention relates to an expandable band drum for a run-flat tyre, i.e. a tyre that can be used even when flat (at slow speed and over limited distances) .
  • An expandable tyre building drum comprises a cylindrical outer shell in turn comprising a number of coaxial, side by side rings.
  • Each ring of the building drum comprises a number of sectors arranged successively in a circle and mounted on an inner actuator which moves the sectors radially to vary the outside diameter of the ring.
  • an innerliner and a body ply are wound about the building drum, which is then expanded to tension the innerliner and body ply so that the innerliner adheres to the body ply.
  • a run-flat tyre differs from a normal tyre by comprising two annular reinforcing inserts inside the sidewalls of the tyre.
  • Two intermediate rings of a run- flat tyre expandable band drum therefore have respective annular seats formed by appropriately shaping the corresponding sectors and for housing the annular reinforcing inserts in the desired position.
  • One example of a run-flat tyre expandable band drum is described in Patent US6488797B1.
  • each reinforcing insert vary depending on the size and characteristics of the run-flat tyre being produced. And, whereas the same intermediate ring can house reinforcing inserts of different thicknesses, even the slightest variation (as little as 1 mm) in the width or position of the reinforcing insert calls for changing the intermediate ring for one with an annular seat of the right size.
  • a large number of intermediate rings must therefore be produced, each comprising a number of sectors and designed to produce a given type of run-flat tyre.
  • Producing a pair of intermediate rings is an expensive, fairly time-consuming job.
  • working with a large number of only slightly different intermediate rings (the difference at times not even being discernable to the naked eye) poses storage problems and increases the risk of mounting the wrong pair of intermediate rings .
  • Figure 1 shows schematically, with parts removed for clarity, a plan view of a run-flat tyre expandable band drum in accordance with the present invention
  • Figure 2 shows a larger-scale view in perspective of a sector of an intermediate ring of the Figure 1 band drum;
  • Figure 3 shows schematic side views of four different configurations of the Figure 2 sector;
  • Figure 4 shows a schematic lateral section of part of a run-flat tyre produced on the Figure 1 band drum.
  • tyre 2 comprises a toroidal body ply 3 having two annular beads 4 and supporting an annular tread 5.
  • a tread belt 6 comprising a number of tread plies is interposed between body ply 3 and tread 5.
  • Body ply 3 supports two sidewalls 7 between tread 5 and beads 4; each sidewall 7 has a reinforcing insert 8 for increasing crush resistance and so enabling use of tyre 2 even when flat (at slow speed and over limited distances) ; and, inside, tyre 2 has a toroidal innerliner 9 impermeable to air.
  • each reinforcing insert 8 is located inwards of body ply 3. In a different embodiment not shown, each reinforcing insert is located outwards of body ply 3 and therefore directly contacts beads 4.
  • band drum 1 has an axis of rotation 10, and comprises a central ring 11, two intermediate rings 12, and two outer rings 13.
  • Each ring 11, 12, 13 comprises a number of sectors 14 arranged successively in a circle and mounted on an inner actuator (not shown) which moves sectors 14 radially to vary the outside diameter of ring 11, 12, 13; and each intermediate ring 12 has an annular seat 15 for housing a reinforcing insert 8 of tyre 2.
  • each sector 14 of intermediate rings 12 is defined by three members 16, 17, 18 - in particular, a lateral member 16 contacting an outer ring 13; a central member 17; and a lateral member 18 contacting central ring 11 - so that each central member 17 is located between two lateral members 16 and 18.
  • Members 16, 17, 18 of each sector 14 of intermediate rings 12 are separate and independent, and are connected to one another by a number of (normally three or four) assembly screws 19 extending parallel to axis of rotation 10.
  • Annular seat 15 of each sector 14 of intermediate rings 12 is preferably formed in central member 17 and lateral member 16, whereas lateral member 18 has a flat cylindrical outer surface. Moreover, lateral member 16 is longer, measured parallel to axis of rotation 10, than central member 17, which in turn is longer, measured parallel to axis of rotation 10, than lateral member 18.
  • spacers 20 of calibrated thickness may be inserted between members 16, 17, 18 of each sector 14 of intermediate rings 12 to keep members 16, 17, 18 a desired distance apart.
  • each spacer 20 is made of plastic, is in the form of a cylindrical tube, and is fitted through with a respective assembly screw 19.
  • each spacer 20 is a small tube of plastic cut to size from a single tube, so that even a large number of spacers 20 of different sizes can be formed cheaply and easily.
  • spacers 20 of calibrated thickness can be inserted between lateral member 16 and central member 17 to adjust the size of annular seat 15 and so adapt annular seat 15 to the actual size of reinforcing insert 8; and, for each sector 14 of intermediate rings 12, spacers 20 of calibrated thickness can be inserted between lateral member 18 and central member 17 to adjust the axial position of annular seat 15 and so adapt the axial position of annular seat 15 to the desired position of reinforcing insert 8.
  • central member 17 and lateral member 18 have a number of through holes 21, each for receiving an assembly screw 19; and lateral member 16 has a number of dead threaded holes 21, each for receiving an assembly screw 19.
  • each assembly screw 19 is inserted through the through hole 21 in lateral member 18 and through the through hole 21 in central member 17, and is screwed into the dead threaded hole 21 in lateral member 16 to tighten members 16, 17, 18 together.
  • each sector 14 of intermediate rings 12 comprises three members 16, 17, 18; in alternative embodiments not shown, each sector 14 of intermediate rings 12 may comprise a different number of (e.g. two or four) members. Obviously, the greater the number of members each sector 14 of intermediate rings 12 comprises, the more complicated it is mechanically, and the greater the extent to which it can be adjusted. Theoretical analysis and testing, however, have shown the best compromise is achieved using three members 16, 17, 18 as described above for each sector 14 of intermediate rings 12.
  • Band drum 1 as described above has numerous advantages : it is mechanically straightforward, is cheap to produce, and provides for adapting the size and position of each annular seat 15 quickly, and with substantially no additional cost, using appropriate spacers 20 (defined by small plastic tubes cut to size) .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Tyre Moulding (AREA)
  • Tires In General (AREA)

Abstract

An expandable band drum (1) for a run-flat tyre (2) having two reinforcing inserts (8); the band drum (1) has a central axis (10) of rotation, and has two intermediate rings (12), each of which is defined by a number of sectors (14) arranged successively in a circle, and has an annular seat (15) for housing a reinforcing insert (8) of the tyre (2); each sector (14) of the intermediate rings (12) is defined by at least two members (16, 17, 18), which are separate, independent, and connected to each other by a number of screws (19) extending parallel to the axis (10) of rotation.

Description

RUN-FLAT TYRE EXPANDABLE BAND DRUM
TECHNICAL FIELD
The present invention relates to an expandable band drum for a run-flat tyre, i.e. a tyre that can be used even when flat (at slow speed and over limited distances) .
BACKGROUND ART An expandable tyre building drum comprises a cylindrical outer shell in turn comprising a number of coaxial, side by side rings. Each ring of the building drum comprises a number of sectors arranged successively in a circle and mounted on an inner actuator which moves the sectors radially to vary the outside diameter of the ring.
In actual use, an innerliner and a body ply are wound about the building drum, which is then expanded to tension the innerliner and body ply so that the innerliner adheres to the body ply.
A run-flat tyre differs from a normal tyre by comprising two annular reinforcing inserts inside the sidewalls of the tyre. Two intermediate rings of a run- flat tyre expandable band drum therefore have respective annular seats formed by appropriately shaping the corresponding sectors and for housing the annular reinforcing inserts in the desired position. One example of a run-flat tyre expandable band drum is described in Patent US6488797B1.
The thickness, width, and position of each reinforcing insert vary depending on the size and characteristics of the run-flat tyre being produced. And, whereas the same intermediate ring can house reinforcing inserts of different thicknesses, even the slightest variation (as little as 1 mm) in the width or position of the reinforcing insert calls for changing the intermediate ring for one with an annular seat of the right size. For each expandable band drum, a large number of intermediate rings must therefore be produced, each comprising a number of sectors and designed to produce a given type of run-flat tyre. Producing a pair of intermediate rings, however, is an expensive, fairly time-consuming job. Moreover, working with a large number of only slightly different intermediate rings (the difference at times not even being discernable to the naked eye) poses storage problems and increases the risk of mounting the wrong pair of intermediate rings .
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a run-flat tyre expandable band drum designed to eliminate the aforementioned drawbacks and which, in particular, is cheap and easy to produce.
According to the present invention, there is provided a run-flat tyre expandable band drum as claimed in the accompanying Claims.
BRIEF DESCRIPTION OF THE DRAWINGS
A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows schematically, with parts removed for clarity, a plan view of a run-flat tyre expandable band drum in accordance with the present invention; Figure 2 shows a larger-scale view in perspective of a sector of an intermediate ring of the Figure 1 band drum;
Figure 3 shows schematic side views of four different configurations of the Figure 2 sector; Figure 4 shows a schematic lateral section of part of a run-flat tyre produced on the Figure 1 band drum.
PREFERRED EMBODIMENTS OF THE INVENTION Number 1 in Figure 1 indicates as a whole an expandable band drum for a run-flat tyre 2 (shown in Figure 4) .
As shown in Figure 4, tyre 2 comprises a toroidal body ply 3 having two annular beads 4 and supporting an annular tread 5. A tread belt 6 comprising a number of tread plies is interposed between body ply 3 and tread 5. Body ply 3 supports two sidewalls 7 between tread 5 and beads 4; each sidewall 7 has a reinforcing insert 8 for increasing crush resistance and so enabling use of tyre 2 even when flat (at slow speed and over limited distances) ; and, inside, tyre 2 has a toroidal innerliner 9 impermeable to air.
In Figure 4, each reinforcing insert 8 is located inwards of body ply 3. In a different embodiment not shown, each reinforcing insert is located outwards of body ply 3 and therefore directly contacts beads 4.
As shown in Figure 1, band drum 1 has an axis of rotation 10, and comprises a central ring 11, two intermediate rings 12, and two outer rings 13. Each ring 11, 12, 13 comprises a number of sectors 14 arranged successively in a circle and mounted on an inner actuator (not shown) which moves sectors 14 radially to vary the outside diameter of ring 11, 12, 13; and each intermediate ring 12 has an annular seat 15 for housing a reinforcing insert 8 of tyre 2.
As shown in Figures 2 and 3, each sector 14 of intermediate rings 12 is defined by three members 16, 17, 18 - in particular, a lateral member 16 contacting an outer ring 13; a central member 17; and a lateral member 18 contacting central ring 11 - so that each central member 17 is located between two lateral members 16 and 18. Members 16, 17, 18 of each sector 14 of intermediate rings 12 are separate and independent, and are connected to one another by a number of (normally three or four) assembly screws 19 extending parallel to axis of rotation 10.
Annular seat 15 of each sector 14 of intermediate rings 12 is preferably formed in central member 17 and lateral member 16, whereas lateral member 18 has a flat cylindrical outer surface. Moreover, lateral member 16 is longer, measured parallel to axis of rotation 10, than central member 17, which in turn is longer, measured parallel to axis of rotation 10, than lateral member 18.
As shown in Figure 3, spacers 20 of calibrated thickness may be inserted between members 16, 17, 18 of each sector 14 of intermediate rings 12 to keep members 16, 17, 18 a desired distance apart.
Preferably, each spacer 20 is made of plastic, is in the form of a cylindrical tube, and is fitted through with a respective assembly screw 19. In other words, each spacer 20 is a small tube of plastic cut to size from a single tube, so that even a large number of spacers 20 of different sizes can be formed cheaply and easily.
More specifically, for each sector 14 of intermediate rings 12, spacers 20 of calibrated thickness can be inserted between lateral member 16 and central member 17 to adjust the size of annular seat 15 and so adapt annular seat 15 to the actual size of reinforcing insert 8; and, for each sector 14 of intermediate rings 12, spacers 20 of calibrated thickness can be inserted between lateral member 18 and central member 17 to adjust the axial position of annular seat 15 and so adapt the axial position of annular seat 15 to the desired position of reinforcing insert 8.
For each sector 14 of intermediate rings 12, central member 17 and lateral member 18 have a number of through holes 21, each for receiving an assembly screw 19; and lateral member 16 has a number of dead threaded holes 21, each for receiving an assembly screw 19. In other words, each assembly screw 19 is inserted through the through hole 21 in lateral member 18 and through the through hole 21 in central member 17, and is screwed into the dead threaded hole 21 in lateral member 16 to tighten members 16, 17, 18 together.
In the embodiment shown in the accompanying drawings, each sector 14 of intermediate rings 12 comprises three members 16, 17, 18; in alternative embodiments not shown, each sector 14 of intermediate rings 12 may comprise a different number of (e.g. two or four) members. Obviously, the greater the number of members each sector 14 of intermediate rings 12 comprises, the more complicated it is mechanically, and the greater the extent to which it can be adjusted. Theoretical analysis and testing, however, have shown the best compromise is achieved using three members 16, 17, 18 as described above for each sector 14 of intermediate rings 12.
Band drum 1 as described above has numerous advantages : it is mechanically straightforward, is cheap to produce, and provides for adapting the size and position of each annular seat 15 quickly, and with substantially no additional cost, using appropriate spacers 20 (defined by small plastic tubes cut to size) .

Claims

1) A band drum (1) for a run-flat tyre (2) having two reinforcing inserts (8) ; the band drum (1) has an axis (10) of rotation, and comprises two intermediate rings (12), each of which comprises a number of sectors (14) arranged successively in a circle, and has an annular seat (15) for housing a reinforcing insert (8) of the tyre (2); the band drum (1) is characterized in that: each sector (14) of the intermediate rings (12) comprises at least two members (16, 17, 18), which are separate, independent, and connected to each other by a number of assembly screws (19) extending parallel to the axis (10) of rotation.
2) A band drum (1) as claimed in Claim 1, wherein spacers (20) of calibrated thickness can be inserted between the members (16, 17, 18) of each sector (14) of the intermediate rings (12) to keep the members (16, 17, 18) a desired distance apart.
3) A band drum (1) as claimed in Claim 2, wherein each spacer (20) is in the form of a cylindrical tube, and is fitted through with a respective assembly screw
(19). 4) A band drum (1) as claimed in Claim 1, 2 or 3, wherein each sector (14) of the intermediate rings (12) comprises three members (16, 17, 18) : a first lateral member (16), a central member (17), and a second lateral member (18) .
5) A band drum (1) as claimed in Claim 4, wherein the first lateral member (16) is located facing a base wall of the band drum (1) , and the second lateral member (18) is located facing the centre of the band drum (1) .
6) A band drum (1) as claimed in Claim 4 or 5, wherein the annular seat (15) of each sector (14) of the intermediate rings (12) is formed in the central member (17) and in the first lateral member (16) .
7) A band drum (1) as claimed in Claim 6, wherein, for each sector (14) of the intermediate rings (12), spacers (20) of calibrated thickness can be inserted between the first lateral member (16) and the central member (17) to adjust the size of the annular seat (15) and so adapt the annular seat (15) to the actual size of the reinforcing insert (8) .
8) A band drum (1) as claimed in Claim 6 or 7, wherein, for each sector (14) of the intermediate rings (12), spacers (20) of calibrated thickness can be inserted between the second lateral member (18) and the central member (17) to adjust the axial position of the annular seat (15) and so adapt the axial position of the annular seat (15) to the desired position of the reinforcing insert (8) .
9) A band drum (1) as claimed in one of Claims 4 to 8, wherein the central member (17) and the second lateral member (18) have a number of through holes (21), each for receiving an assembly screw (19); and the first lateral member (16) has a number of dead threaded holes (21), each for receiving an assembly screw (19) . 10) A band drum (1) as claimed in one of Claims 4 to 9, wherein the first lateral member (16) , measured parallel to the axis (10) of rotation, is longer than the central member (17) and the second lateral member
(18). 11) A band drum (1) as claimed in Claim 10, wherein the central member (17), measured parallel to the axis (10) of rotation, is longer than the second lateral member (18) .
12) A band drum (1) as claimed in one of Claims 1 to 11, wherein each sector (14) of the intermediate rings (12) has at least three assembly screws (19) .
13) A band drum (1) as claimed in one of Claims 1 to 11, wherein each sector (14) of the intermediate rings (12) has four assembly screws (19) .
EP07706235A 2007-01-17 2007-01-17 Run-flat tyre expandable band drum Not-in-force EP2114662B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07706235T PL2114662T3 (en) 2007-01-17 2007-01-17 Run-flat tyre expandable band drum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000036 WO2008087671A1 (en) 2007-01-17 2007-01-17 Run-flat tyre expandable band drum

Publications (2)

Publication Number Publication Date
EP2114662A1 true EP2114662A1 (en) 2009-11-11
EP2114662B1 EP2114662B1 (en) 2010-12-15

Family

ID=38476215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07706235A Not-in-force EP2114662B1 (en) 2007-01-17 2007-01-17 Run-flat tyre expandable band drum

Country Status (6)

Country Link
EP (1) EP2114662B1 (en)
AT (1) ATE491564T1 (en)
DE (1) DE602007011322D1 (en)
ES (1) ES2357691T3 (en)
PL (1) PL2114662T3 (en)
WO (1) WO2008087671A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2535714C2 (en) 2009-08-12 2014-12-20 Пирелли Тайр С.П.А. Method and unit for assembling vehicle wheel tires
CN111002611B (en) * 2019-12-26 2025-03-07 山东宏盛橡胶科技有限公司 A run-flat forming drum

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2551285A1 (en) * 1975-11-14 1977-05-26 Metzeler Kautschuk Radially and axially adjustable tyre assembly drum - has central section comprising stacks of spring-loaded plates
JPS55103942A (en) * 1979-02-01 1980-08-08 Bridgestone Corp Forming drum for tyre
CA2121159C (en) * 1993-07-16 2005-03-29 Kenneth Dean Conger Contoured tire building drum and method of building an extended mobility tire
DE50304584D1 (en) * 2003-09-05 2006-09-21 Continental Ag Method for building a tire carcass

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008087671A1 *

Also Published As

Publication number Publication date
DE602007011322D1 (en) 2011-01-27
EP2114662B1 (en) 2010-12-15
ES2357691T3 (en) 2011-04-28
WO2008087671A1 (en) 2008-07-24
PL2114662T3 (en) 2011-05-31
ATE491564T1 (en) 2011-01-15

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